Cutting machine with revolving knife



CUTTING MACHINE WITH REVOLVING KNIFE Filed oct. s1, 192s nega 9)) 1' 0 w u 'su j P x F192' 2 J Patented Mar.. 17, 1931 UNITED STATES PATENT oEFicE ALOIS KALTENBACI-I AND RICHARD VOIGT, F POTSDAM, GERMANY CUTTING MACHINE WITH BEVOLVING KNIFE Application led October 31, 1928, Serial No. 316,236, and in Germany November 25, 1927.

VThis invention relates to a cutting mathe individual cutting edges of the revolving chine with revolving knife, which is adaptknife may be kept. ed more particularly for cutting textile fab- Circular knives in the shape either of a ries but is also capable of being used for cutregular oi' of an irregular' polygon may be ting metal, Wood, leather, paper and the employed. rlhe regularly shaped knives perlike. 1 mit of a smooth-and rapid cutting of the ina- ;[11 machines having a Circular knife bevtelial, ptltCulIly in the CaSe Of tllili maelled on the periphery, it has been found that terial, While in the case of thicker material notwithstanding' high speeds of revolutionof lt may be preferable to use circular knives in the circular knife a smooth cut cannot ,be ob- 'die Shape of an irregular polygon. 6G tained, for in the known machines of this The Cutting rSm'flhiiies according t0 the type the knife revolves in the meneer ef e Cirpresent invention are preferably so constructcular Saw in a S101; in a guiding 0r Sliding ed as ytvo enabletlie knives to be simply and piece, and the guiding piece slides along unconveniently changed, so that they may be 15 derneath the material that ig t0 be Cut Suitable fOI` any purpose for Which it is Cle- 55 through. The cutting action obtained in such SllGCl t0 employ them. The (3o-acting blade is v machines is essentially the same as is brought Plfferbly eXChangeably arranged in the about in the Case of a, knife hewnv over the sliding member or sliding foot guided underinaterial. neath the material. According te the present invention, en the Furthermore the revolving knife is con- 70 knife of the cutting machine at the position Stmtly PIQSSGCl ilgLIlS the CO-aCtIlg blade at which the actual cutting is effected'a co- Wlth L definite PTGSSUTG by means 0f l Springeetping blade is arranged which @O eperates In order to prevent the blade from becoming withV the revolving knife like a pair of canted or twisted and to mal-:e it revolve eXactscissors. ly parallel to the cto-acting edge, it is guided 7D A still better cutting action can be obtained at on@ 01" mor@ Points 0n its Surface upon T911" if the revolving knife is constructed in' the 913'01 bausz which We Pfafeably aanged Shape 0f e polygon, Se that Cutting edges are or in the bridge piece of the detachable sliding obtained which are in stepped relationship OO- The YOHQTSVOT bans are nuthelmole to one another and which then Co-0perate in Prefemby tted in Such a Way that they are 80 a scissor-like manner With the fio-acting edge. @Gated diametfcauy 'Opposite t0 the CGaCt With .afcililcular knife .the cutting angle is allndget )L f t t. f t1 Ways o t esame magnitude. Hence it is not i 1110, a S a 1S a@ QTY (3o-0R61? 1011 0' 1@ Preis@ verrete sesannisin.informatie egeavvasoeni .i -T.

so that theymaterial asthi ciittliiililsliliel lubricant at the points at which 1t Comes mt() foi-Ward becomes Iiartially bunlied un and Contact with the Co'actngedge a felt plug is is torn llstead of benq'cut upi'smoothl; according to the inventiorfi insertedhin the b i brid e ieee of the slidin cot Whic serves the niltuilyfsteped Cuttlilg edgs of the as a over plate, the said iii-alt pliig being Saturlevov'uig m e t e result 1S Obtained that rated with oil and constantly bearing against me Cutting angle betwefin thE Cu'Cular kmfe the knife. rlhe felt plugV is closed externally 'fmd the Co'actmg edge 1S Contmuauy Chang by a bush which is provided with a lubricating and the cutis effectedv as soon as the most ing. 1,01% e Y ldvmtageou? Cuttlng angl@ .has been ad A cutting machine according to the present lustedi invention is illustrated by Way of example The length ofthe cutting edges depends in the accompanying draWings`, in Whichupon the thickness of ,the material or 0f the Fig. 1 shows the cutting machine inside elelayers of materialto be cut. The thinner vation and Fig-2in plan.v ,M the layer of material to be cut, the shorter Fig. 3 shows the sliding foot in plan, and

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Fig. 4 shows the machine in side elevation with the sliding foot and the knife removet..

Fig. 5 shows in side elevation a knife in the form of a regular polygon, and

Fig. 6 shows another' knife also in siile elevation in the form of an irregular polygon.

Fig. T is a horizontal section on the line 7-7 of Fig. l

L a case-li ,'ne body aj. which may consist of aluminium or somo other light metal, in order that the cutting machine may be as light as possible, is ar 'anger the drive for the revolving knife. rEhe driving i. erably effected from an electric motor throu i a flexible shaft which is coupled in the terior of a support Z) located on the upper si de of the machine body a to a driving shaft c, which carries at its end n' rm o. The worm meshes with a worm wheel c, upon the shaft f of which is mounted the revolving knife g. The revolving knife, in the constructional form illustrated, in the shape of a regular polygon, so that it has distinct cutting edges 7i in stepped relationship to one ano'iher` The front of the knife g is concealed bv the bridge piece i of a sliding foot j', which slides underneath the material to be cut. rlhe sliding foot is preferably made flat and in the shape of a small fiat-iron. rlhe sliding foot and the bridge piece, lik the machine body, may be made of aluminium or some other light metal. In the sliding foot j is exchangeably arranged a co-acting blade 7J. rlChe front end of the coacting blade is pointed and is located in a snit able recess Z in the sliding foot j. The rcai end of the co-acting blade is heid in the recess in the slidin foot by grub screw in.. if nce the co-acting blade can be remover from the sliding foot Yby releasing a single screw, and replaced b v a fresh blade.

The bridge piece z' of the sliding foot .7' is connected with the machine bot v by means of a screw n, which passes through the hollow worm-wheel shaft f and the machine body a. In the interior of a nuto, which clamps the screw n, is arranged a spring p, so that the coacting blade can be tightened on to the revolving knife g with a definitely adjustable pressure. ln order to prevent the bridge piece and the sliding foot from twisting relatively to the machine body there is provided on the machine body a pin y, which engages in a corresponding hole r in the bridge piece of the sliding foot. By this means the position of the sliding foot in relation to the machine body is precisely determined.

The revolving knife g is prevented from canting by rollers s, which are rotatably supported in the bridge piece 2' of the sliding foot j, and project a little on the side facing the blade. ln the constructional form illustrated two guiding rollers s are provided, these guide rollers being arranged diametrically opposte to the co-acting edge.

The lubricating of the revolving knife,

mea/see which is necessary for the satisfactory cooperation thereof with the co-acting blade, is effected by means of a felt plug t, which is ar` ranged in the bridge piece z' of the sliding foot. The felt plug is surrounded by a bush u mounted on the bridge piece i, and can be saturated with oil through a hole o in the bush.

The lubricating of the worm and worm wheel is effected through a bush :0, which is arranged on the rear of the machine body and which is closed by a cap w.

On the machine body a is mounted a handle y, which is preferably made of insulating material, such as vulcanite.

To facilitate the use of the machine there is arranged in the handle a switch .e by which the current of the driving motor can be switched on and off.

W hat we claim is l. A cutting machine, more particularly for textile materials, comprising a revolving knife, a co-acting` blade adapted to co-operate with the revolving' knife in the manner of a ir of .seis-eo rif, and rolling elements such as rollers bearing against one side of the revolving knife to prevent it from canting.

2. A cutting machine, more particularly for textile materials, comprising a revolving knife, a co-acting blade adapted to co-operate with the revolving knife in the manner of a pair of scissors, and rollers bearing against one side of the revolving knife, at points diametrically opposite to the co-acting blade, to prevent the revolving knife from canting.

[L cutting machine, more iriarticularly for textile materials, comprising a casing having a. revolving knife therein, a slide foot, a bridge piece on the slide foot, the said bridge piece covering the front of the revolving knife, a coacting blade adapted to cooperate wzh the revolving knife in the manner of a pair of scissors, the coacting blade being removably mounted in the slide foot, and rollers rotatably supported in the bridge piece and bearing against one side of the revolving knife to prevent it from canting.

A, cutting machine, more particularly for textile materials, comprising a casing havin a revolving knife therein, a slide foot, a b `idge piece on the slide foot the said bridge piece covering the front of the revolving knife, a co-acting blade carried by the slide foot and adapted to co-operate with the revolving knife in the manner of a pair of scissors, a sleeve mounted on the bridge piece at one side of the revolving knife, and a plug f felt saturated with lubricant, lodged in the said sleeve and hearing against the side of the revolving knife to lubricate it.

5. A cutting machine, more particularly for textile materials, comprising a casing having a revolving knife therein in the shape of a regular polygon, a slide foot, a bridge piece on the slide foot, the said bridge piece covering the front of the revolving knife, a co-acting blade carried by the slide foot and adapted to co-operate with the individual edges of the polygonal revolving knife in the manner of a pair of scissors, the co-acting blade being removably mounted in the slide foot, rollers rotatably supported in the bridge piece and bearing against one side of the revolving knife, at points diametrically opposite to the co-acting blade, to prevent the revolving knife from canting, a sleeve mounted on the bridge piece at one side of the revolving knife, and a plug of felt saturated With lubricant, lodged in the said sleeve and bearing against the side of the revolving knife to lubricate it.

6. A cutting machine, more particularly for textile materials, comprising a recessed casing a polygonal revolving knife therein, a slide foot, a bridge piece on the slide foot overlying said recess and secured to said casing, a coacting blade carried by the slide foot and adapted to co-operate With the individual edges of the polygonal vrevolving knife in the manner of a pair of scissors.

7. A cutting machine, more particularly for textile materials, comprising a casing. v

having a revolving knife therein, a slide foot, a bridge piece on the slide foot the said bridge piece covering the front of the revolving knife, a coacting blade carried by the slide foot and adapted to co-operate With the v revolving knife in the manner of a pair of scissors, the coacting` blade being removably mounted in the slide foot.

8. A cutting machine, more particularly for textile materials, comprising a casing having a revolving knife therein, a slide foot, a bridge piece on the slide foot the said bridge piece covering the front of the revolving knife, a. coacting blade carried by the siidefoot and adapted to Co-operate with the revolving knife in the manner of a pair of scissors and resilient means for pressing the revolving knife on one side against the coacting blade.

In testimony whereof We have signed our names to this specification.

ALOIS KALTENBACH. RICHARD VOIGT. 

